Pressure meter



c. J. FECHHEIM ER PRESSURE METER Filed Dec. 31. 1921- WITNESSES: INVENTOR R..=a% WW Can qtfemhe/ mer 3 ATTORNEY Patented Oct 9, 1928. 1,6865 UNITED STATES PATENT OFFER...

rncnnnrmna, or ri'r'rssuzaen, rsNNsYLvAnIA, assrcnon r wns'rnms ELECTRIC & muracrunmc company, A conronarron or rnimsnvsxmrsnssunr. mnrnn.' application filed December 31, 1921. Serial Nol L526,227. I

My invention relates to fluid-pressure de= currents, such as from .a fan or propeller to vices and particularly to devices for measurbe tested (not shown) preferably comprises ing static'pressures of moving fluids. an intermediate portion 7 of rectangular Oneobject of my invention is to provide cross-section, and end portions 8 that may be" 0 a device of the above indicated character that of threaded circular cross=section, or of other 60 i shall accurately indicate the static pressure construction, for attachment to adjacent secof a moving fluid and be substantially un tions of a conduit, not shown. afiected by the velocity or kinetic head The devic e2 is disposedin an opening 9 thereof. i in the portion 7 ,around which are disposed 10 Another object of my invention is to proan annular flange 10, constituting a portion 5 vide a fluid-pressure device that shall faof one wall of the portion 7 and a transcilitate, to a high degree the determination versely projecting annular flange 11. A dia of the characteristics of fluid-impelling dcphragm 12, of thin rubber or othersuitahle vices, such as fans and propellers. material, is held in position, flush with the i A further object of my invention is toproinner surface of one wall'of the portion 7, 9 vide a fluid-pressure indicatingdevice that by a collar or nut device 13 having a relashall be simple and durable in construction, tivel large central openin 14, an annular economicalto manufacture and simple in opport on 15 for holding the 'aphragm 12 in eration. h position, a threaded portion 16 for co-o erai Heretofore it has been found diflicult to action with the flange 11, and an outer ange 75 curately measure the static ressure ofam'ov- '17 for dj stin th ame. illg column of volatile fil ii ,such as 8 11', f9! The portionlfi constit'u a, shoulder bethe reason that any device obs ructmg le tween which and the flange 0, the edges of path may be aflected by the velocity or kinetic the diaphragm 12 and a yieldable washer 18,

2 energy as well as by'the staticpressure. such as felt, arevdisposed. The pointer 19 In practicing my invention, LPP W in is pivoted, by a pin 20, to a standard 21 that a fluid-conducting tube or conduit, a flexible is mounted on the casing 4 and co-op at diaphragm h t s so p flush wlth one with a scale 22 that is alsomounted in the i wall of the conduit, :18 to be substantially uncasing. 4 An opening or window (not affected by the velocity forces, thereby elimishown) may be rovided in the casing PPO- hating them as factors and rendering the de- 1% th i t 19 d th Scale 22 Th vice accurately responsive to static pressures poi t 19 i id d ith an dj ti y- 7 screw 23 adjacent to its *pivoted end for co- The diaphragm s p l y connected to operation w th the upper end of a member or an indicating member. A second fluid-pres i 24 h i it l d u d t th 90 sure device and' a second'indicating device di h 12', i are so disposed relative to the diaphragm as Th pressure d i 6 may comprise a b. to eifect a reading of the static pressure by h b lb 25 d a fl ibl bb t b 26, a null method. That is. when the indicating other suitable device or pump, that is conmember connected to the diaphragm gives nected to a tube 27 communicatin' with the an indication of static pressure, it may he interior of the casing 4. -'Theind1catin demoved to its zero position and the 'staticvice 5 may comprise a usual U-tube' 28 avpressure determined from the second indicating a uantity of water or other suitable ing member. liquid t erein. Q The single figure of the accompanying In operation, since there 19 no obstructlon drawing is awiew, partially in elevation and of any kind in the conduit. the diaphragm partially in section, of a device embodying 12 will respond substant ally only to the. p w my invention. static pressure 'of the-fluid, lrrespectlve of A device constructed in accordance with the velocity thereof, and W111 actuate the my invention comprises, in general; a fiuidointer in accordanee'wrth the magmtudepf 1% conducting tube 1, a pressure-responsive dethat pressure. By ma pulatmg the device vice 2, an indicating device 3Ta casings 6, as by p'umpmg the bulb 25, a stat1c pres for the devices 2 and 3, an indicating device 5 sure may be built up, in the cas ng. 4, 1n opg and a fluid-pressure device 6. position to the static pressure 1n the conduit ,The tube 1, which is adapted to receive air 1, thus moving the d1aphragm12 and the 1,cac,eas

surface of said flat conduit section, indicating mechanism actuated by said diaphragm upon movement thereof, means for applying a force to said diaphragm to hold it su stantially in said position despite the influence of the staticpressure of said fluid, and means for determinin the magnitude of said force.

10. luid-operated mechanism com rising a conduit traversed by a fluid, the wal structure of said conduit comprising a flat section having an opening therein, a diaphragm disposed in said opening and normally occupym a position such that its inner surface is su stantially included in the plane of the inner surface of said flat conduit section, means includinia chamber for appiying pressure to said diap ragm to hold it su tantially in said position despite the influence of the static pressure of'said fluid, and means for determining the magnitude of the pressure existing in said chamber.

a 11. Fluid-operated mechanism comprising a conduit traversed by a fluid, the wall structure of said conduit comprising a section nondeformable under the influence of the static pressure of said fluid and a deformable section substantially in alinement with said first section, and a member actuated by said deformable section.

In testimony whereof, I' have hereunto subscribed my name this 16th day of December,

CARL J; FECHHEIMER; 

